/* Shared look of the first-year statistics demonstrations (courses/*-demo.html). */
:root{--bg-a:#09101b;--bg-b:#0b1220;--surface:rgba(12,21,36,.86);--line:rgba(255,255,255,.12);--text:#eef4ff;--muted:#afbed8;
--teal:#6fe3d2;--pink:#e58aa0;--gold:#e5b45a;--blue:#70b4ff}
*{box-sizing:border-box}
html,body{margin:0;background:linear-gradient(180deg,var(--bg-a),var(--bg-b));color:var(--text);
font-family:"Helvetica Neue",Helvetica,Arial,system-ui,sans-serif;line-height:1.45}
.wrap{max-width:1180px;margin:0 auto;padding:18px 16px 28px}
.eyebrow{font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--teal);font-weight:700}
h1{font-size:clamp(22px,3.2vw,32px);margin:.25rem 0 .35rem;line-height:1.15}
.lead{color:var(--muted);margin:0 0 14px;max-width:900px}
.grid{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:16px;align-items:start}
@media (max-width:900px){.grid{grid-template-columns:1fr}}
.card{background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:14px;min-width:0}
canvas{display:block;width:100%;height:auto;border-radius:12px;background:#0b1424}
.ctl h3{font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin:12px 0 6px}
.ctl h3:first-child{margin-top:0}
.seg{display:flex;flex-wrap:wrap;gap:6px}
button{font:inherit;font-size:14px;color:var(--text);background:rgba(255,255,255,.06);border:1px solid var(--line);
border-radius:999px;padding:6px 12px;cursor:pointer}
button:hover{border-color:var(--teal)}
button.on{background:rgba(111,227,210,.16);border-color:var(--teal);color:#dff6f0}
button.go{background:rgba(111,227,210,.22);border-color:var(--teal);font-weight:700}
.presets button{display:block;width:100%;text-align:left;border-radius:12px;margin:0 0 6px;font-size:13px}
.note{font-size:13px;color:var(--muted);margin:10px 0 0}
.read{font-size:14px;margin-top:10px;padding:10px;border-radius:12px;background:rgba(255,255,255,.04);border:1px solid var(--line)}
.read b{color:var(--teal)}
.score{width:100%;border-collapse:collapse;font-size:13.5px;margin-top:4px;font-variant-numeric:tabular-nums}
.score th,.score td{padding:4px 5px;border-bottom:1px solid var(--line);text-align:right;vertical-align:top}
.score th:first-child,.score td:first-child{text-align:left}
.score th{color:var(--muted);font-weight:600;font-size:11.5px;text-transform:uppercase;letter-spacing:.05em}
.slider{display:flex;align-items:center;gap:10px}
.slider input[type=range]{flex:1;min-width:0;accent-color:#6fe3d2}
.slider output{min-width:3.4em;text-align:right;font-variant-numeric:tabular-nums;font-weight:700}
.lecture{margin-top:16px;padding:12px 14px;border-radius:14px;border:1px dashed rgba(111,227,210,.55);background:rgba(111,227,210,.06);font-size:14px}
.lecture h2{font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--teal);margin:0 0 6px}
.lecture ul{margin:0;padding-left:1.1rem}
.lecture li{margin:.25rem 0}
.lecture a{color:var(--blue)}
footer{font-size:12px;color:var(--muted);margin-top:14px}
footer a{color:var(--blue)}